The lack of a headphone jack is not a deal-breaker for me, personally. I don't use it on my Turbo 2 and didn't use it on my Turbo. For the folks that do rely on it, this phone has an adapter in the box according to the official website, no need to buy new stuff. For the folks that need to charge and listen to music at the same time, this phone will not be right for them unfortunately. There are a ton of other great phones on the market that will do that.
As far as wafer thin, I agree with
@Jonny Kansas 100%. I don't like the wafer thin trend, and annoying ugly camera hump on any phone out there today; so I will not buy one. But on this phone, I do understand why. As Jonny said, they made this phone super thin so you can snap on the Mods and not have too bulky of a phone. I'm not crazy about the way it looks naked, but I would always have a wood / leather / of ballistic nylon back plate on anyway, so my phone will never be wafer thin when I get one of these.
As far as the lack of a headphone jack, I think we're all jumping to conclusions here. It would be quite simple for a Moto Mod back to add a headphone jack and add merely a few mm of thickness in the process. It could be just a cover and headphone jack, or it could be a battery pack that brings the jack along for the ride, and in the case of the projector I'd be surprised if it didn't provide one for audio out.
The Moto Z Force is only 7mm thick (not counting the camera), the Moto Z is an anorexic 5.2mm and my Droid Turbo 2 is 9.2mm (not counting the .5mm camera surround). A headphone plug is 3.5mm, so the socket would be maybe 5.mm. This means to add a headphone jack to the Moto Z would bring the total thickness of the phone including the cover to maybe the same thickness as my Turbo 2 (10.2mm versus 9.2mm, and maybe 12.mm for the Moto Z Force, or only 2.8mm thicker than my phone is now. In fact this audio connection back could incorporate a 1,000mAh battery and a wireless charging coil all in the same thickness. Heck, they could even jump to 2.5mm headphone jack and now the Moto Z is the same thickness as my Droid Turbo 2, and the Z Force would be a scant 1.8mm thicker.
Here's a low profile reflow solder board mount 3.5mm headphone jack from AileExpress, and at a total of 5mm thick, it would work in the fashion mentioned above.
Here's a 2.5mm version at 4mm total thickness.
And speaking of the camera hump, it's really only there if you run the phone completely naked, i.e. no Moto Mod back. If you're adding a wood back, the camera area is cut out and the phone becomes flush on the back. Adding just about any of the potential Moto Mods would offset the camera hump thickness completely, if not beyond as in the case of the JBL speakers and projector. Even a thin plastic back or one with a wireless charging coil would be 3mm thick or so. That camera hump looks to be only maybe 2.5mm thick. I think this is a non-issue.
Frankly I'd forego the headphone jack in lieu of the phone thickness.
Finally, the adapter for the USB-C port to add the headphone jack is included, yes... However it would be only a slightly larger adapter that could give a pass-through of the USB-C and allow charging with a headphone plugged in as well. Alternatively there could be USB-C charging cables coming that incorporate a headphone jack as either a piggyback on the connector or as a "Y" pigtail cable. I wouldn't be surprised if there are ones available now, seeing as how there are lots of other USB-C cable adapter sets I've found giving all kinds of connectivity. I could even see a Moto Mod that has all mentioned above, but instead of being thicker to accommodate the headphone jack it would just be longer and extend off the bottom (or top), instead.
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